Alkaline complex with approx. 235 km² surface exposure, but another 140 km² may be hidden beneath the Hearne Channel of Great Slave Lake. Age: range 2057-2166 Ma.
Successive phases of the complex include the Grace Lake granite ~155 km² in area and within that the Thor Lake syenite complex and within that the Nechalacho deposit.

Mineral List

Mineral list contains entries from the region specified including sub-localities

Localities in this Region

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References

BADHAM, J.P.N. (1979) Geology and petrochemistry of lower Alphebian (2.4-2.0 Ga) alkaline plutonic and hypabyssal rocks in the East Arm of Great Slave Lave, Northwest Territories. Canadian Journal of Earth Sciences, 16, 60-72.